postext.dev
Try the Postext typesetting engine live: edit markdown, manage figures and tables, tune Knuth-Plass justification, and export print-ready PDF and EPUB — in the browser.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 8 · Act 48 · Transact 5 · Score: Not yet scored
Tool inspector
sandbox_run_viewer
Press a button of a viewer's toolbar, or play a video on its pages. regenerate lays the pages of the Canvas, Folio or HTML viewer out again, or writes the PDF, the EPUB or the SCORM package again, and waits for it: the answer carries the viewer's status (pages, file size, an EPUB's warnings). print opens the browser's print dialog on the PDF on screen, for the reader to confirm. download saves the PDF or EPUB on screen through the browser, as it is, even when the book has changed since (sandbox_export writes a fresh file and can hand its bytes back). On the SCORM tab, download writes the package of the chapters and sections ticked and saves it. play_video plays a video of the pages in the Folio (on the open spread) or the HTML viewer, as a click on it does: the one of a resource, on a page or at a point, or the first one on show; stop_video stops them. A viewer other than the one on screen is switched to first. sandbox_set_view changes a viewer's settings; sandbox_go_to_page turns its pages.
Page: /en/sandbox
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
viewer |
string | no | The viewer tab to act in; the one on screen when left out. Another one is switched to. |
action |
string | yes | regenerate: every viewer. print: pdf. download: pdf, epub, scorm. play_video, stop_video: folio, html. |
wait |
boolean | no | regenerate: wait until the pages are laid out or the file is written (default true; a PDF or an EPUB of a long book takes minutes). false answers at once, with the status as the work starts. |
resource |
string | no | play_video: the id of the video resource to play. |
page |
integer | no | play_video: the page the video is on, by the number printed on it. |
x |
number | no | play_video: with y, a point on the video, as fractions of its page (as bound, without the margin of bleed) from the top left corner. |
y |
number | no | — |
Raw JSON schema
{
"type": "object",
"properties": {
"viewer": {
"type": "string",
"enum": [
"canvas",
"pdf",
"folio",
"html",
"epub",
"scorm"
],
"description": "The viewer tab to act in; the one on screen when left out. Another one is switched to."
},
"action": {
"type": "string",
"enum": [
"regenerate",
"print",
"download",
"play_video",
"stop_video"
],
"description": "regenerate: every viewer. print: pdf. download: pdf, epub, scorm. play_video, stop_video: folio, html."
},
"wait": {
"type": "boolean",
"description": "regenerate: wait until the pages are laid out or the file is written (default true; a PDF or an EPUB of a long book takes minutes). false answers at once, with the status as the work starts."
},
"resource": {
"type": "string",
"description": "play_video: the id of the video resource to play."
},
"page": {
"type": "integer",
"description": "play_video: the page the video is on, by the number printed on it."
},
"x": {
"type": "number",
"minimum": 0,
"maximum": 1,
"description": "play_video: with y, a point on the video, as fractions of its page (as bound, without the margin of bleed) from the top left corner."
},
"y": {
"type": "number",
"minimum": 0,
"maximum": 1
}
},
"required": [
"action"
],
"additionalProperties": false
}
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